18819211 has 2 divisors, whose sum is σ = 18819212. Its totient is φ = 18819210.

The previous prime is 18819209. The next prime is 18819239. The reversal of 18819211 is 11291881.

It is a weak prime.

It is an emirp because it is prime and its reverse (11291881) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18819211 - 2¹ = 18819209 is a prime.

Together with 18819209, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (18819011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9409605 + 9409606.

It is an arithmetic number, because the mean of its divisors is an integer number (9409606).

Almost surely, 2^18819211 is an apocalyptic number.

18819211 is a deficient number, since it is larger than the sum of its proper divisors (1).

18819211 is an equidigital number, since it uses as much as digits as its factorization.

18819211 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1152, while the sum is 31.

The square root of 18819211 is about 4338.1114554608. Note that the first 3 decimals coincide. The cubic root of 18819211 is about 265.9911194201.

The spelling of 18819211 in words is "eighteen million, eight hundred nineteen thousand, two hundred eleven".